Roasting-furnace.



No- 831,166. I PATENTED SEPT. 18, 1906. F. KLEPETKO.

ROASTING FURNACE.

APPLICATION FILED NOV. 6, 1905.

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UNITED STATES PATENT UFFIGE FRANK KLEPETKO, OF NEW YORK, N. Y.

ROASTiNG-FURNACE.

Application filed November 6, 1905. Serial Specification of Letters Patent.

Patented Sept. 18,1906.

Te (ZZZ whom, it may concern: Be it known that I, FRANK KLEPETKO, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Roasting-Furnaces, l of which the following is a full, clear, andexact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in roasting-furnaces; and it consists in the novel construction and arrangement of parts more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a middle vertical section of a conventional McDougall ore-roasting furnace having my invention applied thereto, and Fig. 2 is a horizontal section on the line 2 2 of Fig. 1..

The present invention has relation to improvements in cooling systems for the rabble shaft and arms of ore-roasting furnaces of the turret or McDougall type, the object of the invention being to provide a circulating sys tem in which the cooling medium, be the same water or steam or any equivalent thereof, may be drawn off from the hollow arms and shaft by means of pipes confined within the arms and communicating with an outletpipe leading from the shaft. By such an arrangement the cooling medium entering the shaft becomes effectively distributed throughout the arms, every portion of an arm being brought into positive contact with the cooling medium and the formation of local currents or short circuits being impossible.

The advantages of the improved construction will be better apparent from a detailed description of the invention, which is as fol lows: Referring to the drawings, F reprel sents the furnace, and h the several hearths in which the material is treated, the material dropping from the upper hearth successively through the several hearths until it is delivered into the delivery-hopper, (not shown,) I the hearths being provided, respectively, 1 with the central and marginal openings 1 2 for the passage of the material. Passing through the hearths is the rotatable hollow shaft 3, from which radiate the series of holl low arms 4, extending into the several hearths and carrying rakes 5, by which the i material is successively to the hearth immediately beneath it, all as fed from one hearth fully understood in the art. Located within the shaft 3 is a preferably stationary feeder or water-feed pipe 6, the lower end thereof discharging into the bottom of the shaft, whence the cooling medium (preferably water) circulates throughout the shaft and several arms, the shaft being practically closed at both ends. The feeder 6 receives its supply from a pipe 6, passing into the stuffing-box 7. Disposed within the shaft 3 adjacent to the feeder 6 and in parallelism therewith and extending to within a short distance of qhe bottom of the shaft is an outlet or discharge pipe 8, closed at the bottom, the upper end of said pipe projecting through the shaft and terminating in a gooseneck 8, which discharges its contents into a trough 9. Lead ing to the peripheral walls of the outlet-pipe 8 and communicatingwith the interiors of the hollow arms 4 are a series of open-ended branches or conducting pipes or conduits 10, which convey the water of circulation from the outer ends of the hollow arms to the outlet-pipe 8, the said water passing upward through said outlet-pipe and eventually discharging, as above stated, into the trough 9that is to say, to a point adjacent to the feed end of the fee -pipe. By feed end is herein meant the upper end of the pipe 6 or the end withwhich the pipe 6 communicates.

The arrows in the drawings indicate the course of the circulation of the cooling medium. The outlet-pipe 8 being closed at the bottom constrains the water introduced into the shaft to flow to the outer limits of the several arms, whence only the circulating medium can find an outlet. In this way apositive and forcible contact is assured between the water and the walls of both the arms and shaft, and the entire rabble apparatus is thus subjected to the cooling influence of the circulating medium. During the rotation of the shaft the pipe 8, with its branches 10, is carried around bodily about the axis of the shaft, as is obvious. Were the pipe 8 open at the bottom, the circulation would be slightly changed, a portion of the return-water discharging directly through the said pipe 8 and another portion passing first into the branches 10. The feeder 6 need not necessarily extend to the bottom of the shaft, but may be of any length, though it is preferable to iptroduce the water at the bottom of the sha t.

Having described my invention, what I claim is 1. In a furnace having a plurality of hearths, a hollow shaft passing throu h the hearths, a series of hollow arms rafiating from said shaft and extending into the several hearths, a feed-pipe passing longitudinally through and discharging into the shaft, an outlet-pipe located within the shaft, and a series of branches leading to said outlet-pipe and communicating with the interior of the hollow arms for conducting the circulating medium from the arms into the outlet-pipe, substantially as set forth.

2. In a rabble apparatus, a hollow shaft and hollow arms therefor, a feeder passing longitudinally through, and discharging a circulating medium into the shaft, an outletpipe located within the shaft and discharging at a point adjacent to the feed end of the feeder, and a series of branches leading to said outlet-pipe and communicating with the interiors of the hollow arms, substantially as set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

, FRANK KLEPETKO. Witnesses:

EMIL STAREK,

J. E. DEAKIN. 

